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Discussion Starter · #1 ·


am i reading that right that they list the Max COAL at 2.260, but tested the 80gr CC at 2.360?

Typo? anyone have 80gr data in their books (i will check tonight in my own)? i know Sierra has 80 and 90gr Ar15 specific data in their book... the CC cant be so different from the SMK.
 

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I get the mag function... of course the AR-15 load book will have all COAL at 2.260" or less.

Lyman #49 lists an 80gr HPBT at 2.550" OAL. It also lists a 75gr Jacketed A-Max at 2.390" OAL. I suspect (based on bullet shape) that although this wouldn't work in AR magazines (and 57K can attest to loading a 75gr Hornady to 2.255"), that the ogive of the bullet is shallow enough to allow such a long OAL. What's funny to me is they have the 77gr HPBT listed at 2.260" OAL.

A little inconsistent... haha
 

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Discussion Starter · #7 ·
I get the mag function... of course the AR-15 load book will have all COAL at 2.260" or less.

Lyman #49 lists an 80gr HPBT at 2.550" OAL. It also lists a 75gr Jacketed A-Max at 2.390" OAL. I suspect (based on bullet shape) that although this wouldn't work in AR magazines (and 57K can attest to loading a 75gr Hornady to 2.255"), that the ogive of the bullet is shallow enough to allow such a long OAL. What's funny to me is they have the 77gr HPBT listed at 2.260" OAL.

A little inconsistent... haha
the long throat COALs suggest that >2.260" is meant for .223 Match chambers. I was just surprised that they listed the CC at 2.36.
 

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Sierra makes a similiar jump in coal in their 77s and 80s as well. 2.26" and 2.55" respectively. I do not think it is a typo.
 

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i know Sierra says their 80gr MK is seated at 2.260 in the AR15 load section. that only makes sense.
I downloaded a Sierra PDF file that puts the 80 gr hpbt MK at 2.55".

your data came from the manual ??? I downloaded mine from their website lol. I wonder which is newer data???? at the top of this file it say AR15 loads as well.
 

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69 data

I have plenty more data if anyone needs it PM me or email Sierra. I believe they may have emailed these, it may be on their site, honestly I can't remember.

I have 308 data as well.
 

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yea it is for ar-15s. I thought it said it on the PDF . What is the difference aside from coal??? can you load bolt guns hotter????
 

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Discussion Starter · #14 ·
yea it is for ar-15s. I thought it said it on the PDF . What is the difference aside from coal??? can you load bolt guns hotter????
because you are not restricted to a magazine length (usually) of 2.260 you can get away with loading them longer. the only problem you could run into is freebore length. the shorter it is, the more pressure can be present. long throated .223 chamber is usually just called .223 Match. when i measured my AR15 to the lands it was COAL 2.365.

I just cannot believe that they would put bolt gun (single shot) data in the AR15 section of the loading guide!
 
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